This beautiful hand blown art glass vase is screaming Blenko to me but I've not been able to identify the shape as a guaranteed Blenko piece. The colour appears to be the same as one of their sea green colours, the pontil on the base and the general quality of the glass all seems like Blenko to me (and I do collect Blenko glass myself).
This piece is 8 1/4" in height and 5 1/4" wide on each side of the triangle.
In excellent condition it has no chips, nicks or cracks. There is a very minor water line about 1.5" up the vase but I believe this would come out with repeated scrubbing.